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Securities - Net gains and losses on trading securities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Securities |  |
Net (losses) gain on sales transaction | $ (1,239) | $ 119
Net mark to mark losses | (1,976) | (726)
Net losses on trading securities | $ (3,215) | $ (607)

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- Definition Amount of gain losses on mark to market debt securities trading. + References No definition available. + Details
Name: | ssb_DebtSecuritiesTradingGainLossOnMarkToMarketSecurities
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of gain losses on sale of debt securities trading. + References No definition available. + Details
Name: | ssb_DebtSecuritiesTradingGainLossOnSaleOfSecurities
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ssb_InvestmentSecuritiesDisclosureAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_DebtSecuritiesTradingRealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration